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If you are talking about marks on the crank and cam just turn the crank shaft until the key is at the top and then you should have a key on your cam and also a mark on the gear that bolts up to it (should be a dot on the gear.) these should be pointed up also. as far as the exact degree on ignition timing i am not sure on a camry

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timing belt replacement is a little tedious.first remove negative battery cable and move away from battery.remove serpentine belt and set aside.on models with A/c remove compressor and set aside, then take mounting bracket off.going through the fender well behind the tire remove the lower pullywith a torx wrench. remove the cover for timing belt. it goes all the from top to bottom.this is when you line up the timing marks to make it easier to reassemble. There is a belt tensioner on the timing belt toward the rear of car.loosen and the belt will come off. When you put the belt in and set the tensioner make sure the timing marks are aligned.clean the old gasket off the cover and put in a new one to avoid leakage.

Turn the crankshaft clockwise and align each timing mark to set the number one piston to TDC of its compression stroke.

Remove the timing belt under cover rubber plug and then install special tool MD998738. Screw the special tool until it contacts the timing belt tensioner arm.

NOTE
The special tool must be screwed in gradually at the rate of a 30 degree turn per second. If it is screwed in all at once, the timing belt tensioner adjuster rod will not easily retract and the tool may bend.

Gradually screw in the special tool and then align the timing belt tensioner adjuster rod set hole “A” with the timing belt tensioner adjuster cylinder set hole “B”.

Insert a wire or pin in the set holes to lock the assembly in place. After removing the special tool, loosen the timing belt tensioner pulley mounting bolts and remove the timing belt. If the belt is being reused be sure to mark the direction of rotation (clockwise) on the belt.

You need to get a manual. Try the Haynes manual for your car. Try autozone; generally available for around $20. This is not the type of thing that can be covered here in enough detail to do you any good. You need a picture.Buy new timing belt. Disconnect negative battery cable. Remove timing belt cover. make sure cylinder #1 is set at TDC. making sure all components are properly aligned and loosen pensioner to remove old timing belt. Install new timing belt. Tension belt, ensure all components are aligned properly, replace timing belt covers and reconnect battery.

Your camshaft and crankshaft pulleys have to be properly aligned upon installation of the timing belt. The cogs on the belt, should fit precisely with the teeth of the pulleys. Your # 1 engine cylinder should be moved to "Top Dead Center" before installing the belt. This means no compression once the top of the piston cylinder reaches the top of the chamber.